# # set  特点：元素是唯一的,无序
# a = {'apple',3.14,10086,'world',3.14}
#
# # tuple  不可变的列表
# b = ('apple',3.14,10086,'world',3.14)
# print(b.index(3.14))
# print(b.count(3.14))
# # 如果元组只有一个元素，必须在该元素的最后面，加上 ,
# c = ("3",)
# print(type(c))




# a = ('python', 'postman', 'jmeter', ['mysql', 'oracle', 'redis'] )
# a[3].append('hello')
# print(a)










